dunlap



Oct. 15, 1929. c, DUNLAP 1,731,715

APPARATUS FOR MAKING BOBBINS Original Filed Nov. 25. 1927 Patented d ct.l5, i929 "lilll'hild YATES PATENT OFFICE CHAR-l4.

SOLN'OCG EEODUCTS COIVIEANY, 0F HARTS'VILLE, SOUTH CAROLINA, ACORPORATION 03? SOUTH. GAR-OLINA APPARATUS FOR MAKING BOBBINS Originalapplication filed November 25, 1927, Serial No. 235,691.

November 23, 1928.

The present invention relates to machines for the manufacture of bobbinsof the type adapted for use in the textile industry as cores or supportsfor thread windings. I

lilore particularly stated the present invention relates to machineryfor making paper bobbins of the bottle type. The bobbin known as thebottle bobbin comprises essentially a cylindrical portion and a conicalportion, these portions being coaxial and se cured together so thattheir surfaces meet in a circular line. Bobbins of this character haveheretofore been generally made of wood although other materials,including paper have been utilized. The present invention contemplatescertain improvements in machines for the production of paper bobbinswhereby such bobbins can be made very quickly and cheaply butnevertheless veryaccurately so that the thread bearing surfaces of thecylindrical and conical portions there of are truly co-axial and trulyconcentric with the axis of the bobbin. The machine which I have devisedfor making these bobbins may be constructed. in various ways to complywith local requirements, and the invention is not limited to the exactform of the appara tus which is illustrated in the accompanying drawingsby way of example, and hereinafter described in detail. This applicationa division of my co-pending application Serial lilo. 235,691, filed Nov.25, 1927.

in the drawings:

lligure 1 is a side elevation of an apparatus suitable for reaming outthe interior of the conical portion of a bobbin;

Figures 2 and 3 are sectional detail views on a larger scale, showingco-acting members of the apparatus in different positions;

Figure 1 is a longitudinal sectional view through the conical portion ofa bobbin, after its completion, but before its assembly with thecylindrical portion; and

Figure 5 is a side elevation of a finished bobbin, partly broken away toshow the joint between the two portions thereof.

rel-ring first to Figures 1 to 3. In Figure l is illustrated somewhatdiagrammatically a machine suitable for reaming out the lower end of apaper or fabric cone to form therein Divided and this application filedSerial No. 321,467.

a cylindrical surface which is adapted to threaded on the lower end of ahollow cylinder or pipe let and has a sharp serrated cutting edge, asindicated. The pipe 14 is rotatable in vertically spaced and alignedbearings 15 and 16 which are rigid with the upper portion of standard10, and has fixed thereon between these bearings a pulley 17. Rotationis imparted to the cutter by a belt 18 which passes around pulley l7 andover an idler guide pulley 19 and around a drive pulley 20 which isdriven by a suitable motor (not shown).

The chuck 12 is frustro-conical in form and may have its lower smallerend integral with the cylinder 21. This cylinder 21 is mounted forvertical reciprocation in a bearing 22 rigid with frame 10, and isformed with a collar 23 adapted to engage bearing 22 to limit thedownward movement of the chuck. Bearing 22 is aligned with bearings 15and 16 so that the axis of chuck 12 is mounted in exact coincidence withthe axis of reamer 11. The chuck is adapted to be raised by a foot lever24 which is fulcrumed at 25 on the base of upright 10. This lever isconnected by link 26 to one arm of a lever 27, the other arm of which isbifurcated and slotted to receive pins projecting laterally from thelower end of pipe 21. The'chuck is urged to the lower position shown inFigure 1 by gravity or by a suitable spring or both.

A. cone previously wound by known methods and preferably one which hashad its exterior surface ground and finished in accordance with themethod described in my Patent 1,634,492 dated July 5, 1927, is placed inchuck 12 as shown in Figure 1. The interior conical surface of the chuckis of such dimensions that when the. cone is seated therein the lowerend of the cone will project very slightly within the pipe 21, asindicated in Figure 2. With the cone thus positioned and the cutter 13rapidly rotating the operator depresses the foot lever 24: and therebyraises the chuck with the cone therein to the position shown in Figure3. In moving to this position the cutter reams out the lower end of thecone, forming a true cylindrical surface in said lower end, which wasprecisely coaxial with the axis of the exterior surface of the cone, andwhich meets the exterior conical surface at a very sharp angle, forminga feather edge, as indicated in Figure 4. It is to be observed that thediameter of cutter 13 is substantially equal to the internal diameter ofpipe 21, as indicated in Figure 3, and therefore produces a very sharpfeather edge at the small end of the cone. The nose or apex of the cone,severed by the reaming operation, is preferably blown out through thelower end of pipe 21 by an air blast delivered from a tube 30 whichextends down through pipe l t to a point adjacent the cutter, or may beremoved by a suitable mechanical means. When the reaming operation isfinished the operator releases lever 24 thereby permitting the chuck todrop away from the reamer so the cone may be removed from the chuck andanother inserted.

The cone prepared by the method and with the apparatus above describedis adapted for assembly with the cylindrical part or channels to termthe finished bottle bobbin. It is necessary that the cylinder beprecisely coaxial with respect to the axis or the cone in the finishedbobbin, since in use the bobbins are rotated at a high rate and anyeccentricity thereof would render the bobbin useless. For that reasongreat care is exercised in the step of gluing the conical portion of thebobbin to the cylindrical portion to obtain the completed article shownin Figure The contacting surfaces of the cylindrical and conicalportions oi the bobbin are secured together by a suitable paste or glueand, when dry, the bobbin is ready for use. It will be noted that thereis no abrupt shoulder along the line of junction oi the outer conicalsurface of the conical portion of the bobbin and the outer cylindricalsurface of the cylindrical portion ot the bobbin but that, on the otherhand, these two surfaces meet along a circular line. This is important.The elimination of this shoulder, which. has been common to other types0-1: paper bobbins heretofore made, is very desirable inasmuch as itprevents piling up of the threads at this junction point with resultingtangling or uneven unwinding thereof. By means of the apparatusdisclosed it is possible to get this line junction with totalelimination of a shoulder at the bottom, whereas by means of no priorapparatus of which I am aware would this result he realized. Thus bymeans of the present apparatus the cone which is intended to comprisethe base of the bottle bobbin is cut away in such manner as to have atrue feather edge at its forward end instead of a terminal edge having aconsiderable thickness. This feather edge eli ect may be realized byfirmly supporting the cone during the cutting operation so that noportion 01 it is thrust outwardly by the cutter 13 during thisoperation.

Assembly of the cylindrical and conical portions oi the bottle bobbin ispreferably efi'ected by the means and in accordance with the methoddisclosed in my copending application above referred to, but may beeffected in any other manner thought suitable or desirable. In any eventhowever it is probably best to insert the tubular portion oi the bobbinthrough the base of the conical portion rather than to insert it in theopposite direction inasmuch as the lit is a very close one and it is notdesired to injure the feather edge in any manner. By means of myimproved machine the conical portion of a bottle bobbin can be preparedquickly, easily, accurately and cheaply and the resulting bobbin is ofsuperior quality, the exterior surface of the conical member mergingsmoothly with the cylindrical surface of the cylindrical member with noshoulder at the joint.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

1. Apparatus for preparing a l' rusto-conical member for attachment to atubular member, comprising in combination, a holder for thefrusto-conical member having an upper frusto-conical portion in whichsaid member is adapted to seat and a lower cylindrical por tion intowhich the lower end of said member is adapted to slightly project, and arotary cylindrical cutter co-axial with said holder and having adiameter substantially equal to the diameter of the cylindrical part ofsaid holder, and means for reciprocating one of said parts towards andfrom the other.

2. Apparatus for preparing a frusto-conical member for attachment to atubular member comprising in combination a frame, a holder for thefrusto-conical member having an upper i rusto-conical portion in whichsaid member is adapted to seat and a lower cylindrical portion intowhich the small end of said member is adapted to slightly project, saidmember being mounted on said frame for vertical reciprocation, a leverconnected to said member for reciprocating the same, and

a cylindrical cutter rotatable in said frame above said holder coaxialwith the holder and having adiameter substantially equal to the diameterof the cylindrical part of said holder.

3. Apparatus for preparing the trustoconical member of a bottle bobbin,tor assembly with the cylindrical portion thereof, comprising, incombination, a holder for a conical member having a trustoronical' coneseating surface which terminates in a circular line lying in a planenormal to the axis of said conical surface and through which plane thepoint or nose of acone projects when seated in said holder, and acutting member provided with a cutting edge adapted to make acylindrical cut through the wall of such cone, which cut shall becoaxial with the cone and have adiameter substantially equal to thediameter of the circular terminating line of the holder, said holder andcutting member being relatively movable in such manner that the cuttingmember may be caused to enter the interior of the cone from the base,and sever the nose therefrom, along a cylindrical surface as aforesaid.

In testimony whereof I hereunto afiix my signature.

CHARLES KIRKLAND DUNLAP.

